Heald was opposed to Brexit prior to the 2016 referendum.[6] In December 2017 Heald voted with fellow Conservative Dominic Grieve and nine other Conservative MPs against the government, and in favour of guaranteeing Parliament a "meaningful vote" on any deal Theresa May agrees with Brussels over Brexit.[7][8]

He and his wife Christine (née Whittle) live in his Hertfordshire constituency, in the market town of Royston; they have a son and two daughters.[9] His daughter Sarah stood as a Conservative candidate in Manchester Withington in the 2017 election.